1. J. F. Cariñena, C. López and J. Nasarre: Proc. 5th. Int. Conf. on Squeezed States and Uncert. Relations, p. 315, D. Han, J, Janszky, Y.S. Kim and V. Manko (Eds.), NASA/CP-1998-206855.
2. Lectures on Nonlinear Orbit Dynamics;Dragt,1982
3. Computation of nonlinear behavior of Hamiltonian systems using Lie algebraic methods
4. Orbits, symplectic structures and representation theory;Kostant,1965